Global Patent Index - EP 2522445 A1

EP 2522445 A1 20121114 - Synthesis of nanoparticles comprising oxidation sensitive metals with tuned particle size and high oxidation stability

Title (en)

Synthesis of nanoparticles comprising oxidation sensitive metals with tuned particle size and high oxidation stability

Title (de)

Synthese von Nanopartikeln mit oxidationsempfindlichen Metallen mit abgestimmter Partikelgröße und hoher Oxidationsstabilität

Title (fr)

Synthèse de nano-particules comportant des métaux sensibles à l'oxydation avec taille de particules réglée et une grande stabilité à l'oxydation

Publication

EP 2522445 A1 20121114 (EN)

Application

EP 11165705 A 20110511

Priority

EP 11165705 A 20110511

Abstract (en)

Process for the synthesis of nanoparticles comprising oxidation sensitive metals, in particular copper comprising the following steps: - Preparation and nucleation of citrate-capped Metal-hydroxide nanoparticles, - reduction of the intermediate citrate-capped Metal-hydroxide nanoparticles to Metal 0 by reduction via NaBH 4 Cu 0 nanoparticles with narrow size distribution are obtained by NaBH 4 -induced reduction of C u Cl 2 ·2H 2 O in diethylene glycol. The course of the reaction essentially involves an intermediate formation of Cu(OH) 2 nanoparticles as well as the presence of citrate to control the nucleation of almost monodisperse and non-agglomerated Cu 0 nanoparticles. The citrate-capped Cu 0 nanoparticles of the invention are surprisingly stable against air oxidation. Via simple solvent evaporation, porous Cu 0 thin-films are prepared on glass substrates that exhibit bulk-like sheet resistances of 0.23 - 0.42 © –¡ after vacuum sintering at 250 °C (bulk-Cu sheet under similar conditions with: 0.3 © –¡ ). With these features the as-prepared, citrate-capped Cu 0 nanoparticles become highly relevant to electronic devices in particular thin-film electronics, thin-film sensors and high-power batteries.

IPC 8 full level

B22F 1/054 (2022.01); B22F 9/24 (2006.01); H01L 21/304 (2006.01); H01L 31/0352 (2006.01); B22F 1/16 (2022.01)

CPC (source: EP US)

B22F 1/054 (2022.01 - EP US); B22F 1/056 (2022.01 - EP US); B22F 9/24 (2013.01 - EP US); B82Y 30/00 (2013.01 - EP); H01B 1/02 (2013.01 - EP); H01B 1/026 (2013.01 - EP); H01L 21/288 (2013.01 - EP); H01L 31/022425 (2013.01 - EP); H05K 1/097 (2013.01 - EP); H05K 2201/0257 (2013.01 - EP)

Citation (applicant)

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Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 2522445 A1 20121114

DOCDB simple family (application)

EP 11165705 A 20110511